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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2014
Sep. 30, 2013
Income Tax Provision      
Deferred tax benefit $ 11.0 $ 11.1  
Decrease in deferred tax liability   16.3  
Reclassification of deferred tax liabilities to equity   54.5  
Deferred income tax provision   49.6 24.0
Liability for uncertain tax positions including interest and related charges 19.4 19.4  
Accrued income tax interest and related charges 1.7 1.7  
Unrecognized tax benefits that, if recognized, would affect effective tax rate 16.8 16.8  
Controlling Interest
      
Income Tax Provision      
Deferred tax benefit   $ 7.5